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Cell search process for wireless communication system

a wireless communication system and cell search technology, applied in power management, electrical equipment, radio transmission, etc., can solve the problems of requiring significant processing power and time, affecting and requiring a large amount of processing power and time for the standard cell search process, etc., to achieve the effect of facilitating the understanding of the invention

Active Publication Date: 2009-10-06
LENOVO INNOVATIONS LTD HONG KONG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cell search process therefore takes a significant time and the resulting full band scan may take several minutes.
Moreover, the standard cell search process requires significant processing power and time, which occupies resources that may be required for other processing functions and consumes power in the mobile station.

Method used

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  • Cell search process for wireless communication system
  • Cell search process for wireless communication system
  • Cell search process for wireless communication system

Examples

Experimental program
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Embodiment Construction

[0031]Referring now to FIG. 1, there is shown generally a -wireless communication system 10 including a W-CDMA network 12 and base stations 14, 16 and 18, A mobile station 20 can receive a number of radio signals transmitted from cells served by the base stations 14 to 18 via multiple propagation paths. When the mobile station 20 performs a cell search, it receives a plurality of multi-path radio signals originating from the base stations 14 to 18, which are shifted in timing from each other due to signal reflection and diffraction.

[0032]FIG. 2 is a schematic diagram showing a schematic structure of the mobile station 20. This mobile station 29 includes an antenna 32, a demodulator for down converting the radio signals received by the antenna 32 to a base band frequency, and analogue to digital converter 36 which converts received analogue signals into digital signals, a slot timing detector 3B for detecting slot timing during cell search, a frame timing and code-group detector 42 w...

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PUM

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Abstract

A method of cell search in a wireless communication systems having a plurality of base stations and a mobile station, each of the plurality of base stations serving a separate cell within a service area and transmitting a common primary synchronization code (PSC) in a primary synchronization channel within a slot of a radio frame, the method including the steps of: (a) scanning (72) through radio channels in scanning increments corresponding to a standard channel raster; (b) estimating (98) the PSC signal-to-noise ratio of each radio channel; (c) if a PSC signal-to-noise ratio is above a first predetermined threshold level (100), completing a cell search procedure including slot synchronization, frame synchronization and scrambling code detection steps for that radio channel; (d) if the cell search procedure is successfully completed (112) for the radio channel in step (c), increasing the scanning increments to the broadcast frequency separation between cells; (e) when all radio channels are scanned in step (d), sorting (74) the scanned radio channels in descending order by PSC signal-to-noise ratio; and (f) performing (76) the cell search procedure on each sorted radio channel in descending order.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates generally to wireless communication systems having a plurality of base stations and a mobile station, and in particular to the cell search process performed by the mobile station. The present invention is suitable for use in spread spectrum systems, and in particular in wide band code division multiple access (W-CDMA) systems, and it will be convenient to describe the invention in relation to that exemplary, non-limiting application.[0002]In W-CDMA and like wireless communication systems, a mobile station can receive a number of radio signals transmitted from several base stations—each serving a separate cell within a service area—via multiple propagation paths. A cell search process is carried out by the mobile station to synchronise the mobile station with a base station of a cell prior to transmission of traffic data, such as voice data.[0003]The standard cell search process involves three steps, namely slot synchroni...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04B7/216H04W48/16H04W52/02H04W88/02
CPCH04B1/70735H04B1/7083H04B2201/70702
Inventor ZALIO, FILIPDOBRICA, VASIC
Owner LENOVO INNOVATIONS LTD HONG KONG
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